public override void FlipX(PointF pos)
{
base.FlipX(pos);
start = PointFExt.FlipX(start);
end = PointFExt.FlipX(end);
}
public override void FlipX(PointF pos)
{
base.FlipX(pos);
for (int j = 0; j < Polygon.Count; j++)
{
Polygon[j] = PointFExt.FlipX(Polygon[j]);
}
}